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9.26.9.5.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F20,F80-OS2.3]
Application
Application 1: 
Fastening of wood shingles, on roofs of buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of:
  • if not enough fasteners were used, the displacement of shingles under wind-uplift and gravity loads,
  • if too many fasteners were used, the splitting of shingles under loads imposed by the shrinkage of shingles, or
  • if fasteners were exposed to water, corrosion, which could lead to a reduction in the fasteners' ability to resist expected loads, which could lead to the displacement of shingles.
This is to limit the probability of water penetrating directly to roof decking or sheathing, which could lead to deterioration, which could lead to the structural failure of roofs or assemblies protected by roofs, which could lead to harm to persons.
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